Agriculture Reference
In-Depth Information
Table 31
Type and symptoms of cold damage in rice
Growth stage
Critical
temperature
(ºC)
Type of cold injury
Germination
10
Poor, delayed
Seedling
13
Retarded seedling growth Leaf
discoloration, seedling rot
Vegetative
15
Inhibited rooting, growth and tillering
Delayed panicle initiation
Reproductive
17
Inhibited panicle development
Degenerated spikelets
Disturbed meiosis and pollen formation
Delayed heading
Heading
17
Poor panicle exsertion
Inhibited anther dehiscence and
pollination
Maturity
14
Poor grain fi lling and quality
Early leaf senescence
Table 32
Effects of organic matter application on rice yield.
Treatment
Heading
date in
August
Filled grain
ratio (%)
Brown rice yield
(tha
-1
)
N-P-K (optimum)
12
10.3
0.44
50% + rice straw
10
58.1
2.33
50% + animal residue
9
49.8
2.36
50% + compost
9
52.5
2.31
50% + Compost + animal
residue
9
54.2
2.58
In Faisalabad, Pakistan Akram et al. (2007) showed the
yield of Basmati rices gradually decreases as the transplanting
dates are delayed after July 10 due to occurrence of cold during
reproductive phase. Yield reduction in delayed planting is
